package enums;// enums/Reflection.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Analyzing enums using reflection

import onjava.OSExecute;

import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.Set;
import java.util.TreeSet;

enum Explore {HERE, THERE}

public class Reflection {
    public static Set<String> analyze(Class<?> enumClass) {
        System.out.println(
                "_____ Analyzing " + enumClass + " _____");
        System.out.println("Interfaces:");
        for (Type t : enumClass.getGenericInterfaces())
            System.out.println(t);
        System.out.println(
                "Base: " + enumClass.getSuperclass());
        System.out.println("Methods: ");
        Set<String> methods = new TreeSet<>();
        for (Method m : enumClass.getMethods())
            methods.add(m.getName());
        System.out.println(methods);
        return methods;
    }

    public static void main(String[] args) {
        Set<String> exploreMethods =
                analyze(Explore.class);
        Set<String> enumMethods = analyze(Enum.class);
        System.out.println(
                "Explore.containsAll(Enum)? " +
                        exploreMethods.containsAll(enumMethods));
        System.out.print("Explore.removeAll(Enum): ");
        exploreMethods.removeAll(enumMethods);
        System.out.println(exploreMethods);
        // Decompile the code for the enum:
        OSExecute.command(
                "javap -cp build/classes/main Explore");
    }
}
/* Output:
_____ Analyzing class Explore _____
Interfaces:
Base: class java.lang.Enum
Methods:
[compareTo, equals, getClass, getDeclaringClass,
hashCode, name, notify, notifyAll, ordinal, toString,
valueOf, values, wait]
_____ Analyzing class java.lang.Enum _____
Interfaces:
java.lang.Comparable<E>
interface java.io.Serializable
Base: class java.lang.Object
Methods:
[compareTo, equals, getClass, getDeclaringClass,
hashCode, name, notify, notifyAll, ordinal, toString,
valueOf, wait]
Explore.containsAll(Enum)? true
Explore.removeAll(Enum): [values]
Compiled from "Reflection.java"
final class Explore extends java.lang.Enum<Explore> {
  public static final Explore HERE;
  public static final Explore THERE;
  public static Explore[] values();
  public static Explore valueOf(java.lang.String);
  static {};
}
*/
